Date.prototype.Format = function (fmt) { //author: wchao
 var o = {
     "M+": this.getMonth() + 1, //月份 
     "d+": this.getDate(), //日 
     "H+": this.getHours(), //小时 
     "m+": this.getMinutes(), //分 
     "s+": this.getSeconds(), //秒 
     "q+": Math.floor((this.getMonth() + 3) / 3), //季度 
     "S": this.getMilliseconds() //毫秒 
 };
 if (/(y+)/.test(fmt)) fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
 for (var k in o)
 if (new RegExp("(" + k + ")").test(fmt)) fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
 return fmt;
}